Manufacture and application of agents for combating rodents



Patented Oct. 24, 1939 UNITED STATES PATENT OFFICE MANUFACTURE ANDAPPLICATION OF AGENTS FOR COMBATING RODENTS No Drawing. ApplicationJanuary 5, 1939, Serial No. 249,376. In Germany February 4, 1936 3Claims. (01. 167-46) This invention relates to the manufacture andapplication of agents for combating rodents.

The hitherto known agents for combating rodents which have been used asstomach poisons 5 were based upon flour occasionally admixed with plantlecithin and fat. Such bases sufier from the disadvantage that they areliable to decompose. Fat easily gets rancid and ill-smelling 7 whereasflour-if worked up into a paste-is easily decomposed by fungi andbacteriae. If preserving agents are added one runs the risk that theanimals to be killed do not eat such a preparation. As sugar, which hasalso been proposed as base for such agents, is hygroscopic thepreparations based thereupon easily deliquesce. Rodenticides which havebeen put on the market in cake-like shapes involve the disadvantage ofdrying up and hardening so that the rodents hardly take them.

It has now been found that watersoluble cellulose derivatives,especially those selected from the group consisting of methylcelluloseand hydroxy alkylated cellulose derivatives are very well suited as basefor rodenticides which are used as stomach poisons.

The above named cellulose derivatives are particularly suited forcombating rats and mice. It has already been proposed to groundfungicides and insecticides with methylcellulose and filling agents todry powdery mixtures for the manufacture of seed grain disinfectants andinsecticides. Such agents serve for instance for combating caterpillars.As caterpillars already eat the poison without baits it could not beforeseen that rodents for the destruction of which the selection of thebait is very important would take the agents according to the presentinvention. This was the more astonishing as rodents generally can onlybe allured by victuals whereas the said cellulose derivatives cannot belooked upon as ioodstufis.

The following pastes have proved to be particularly suitable:

Kilograms Methylcellulose 7.50 Thalliumsuliate 2.50 5 Green dyestufl0.05 Water 89.95

Methylcellulose 7.00 Barium carbonate 10.50 Green dyestu'fi 0.05 10Water 82.45

Hydroxyethyl-methylcellulose 3 Phosphorus 2 Melted tallow 40 Water 15Hydroxyethylated cellulose ethane sulfonic acid so 12 Potassiumdinitro-cresolate 10 Water 88 Glycol-glycolic acid-methyl-estercellulose 20 ether 5 v Thallium sulfate 2.5 Dyestufl 0.05 Water Thesesubstances are admixed to the bait in the usual manner.

We claim:

1. A rodenticide acting as a stomach poison comprising as carrier forthe poison used a water- 30 soluble cellulose derivative selected fromthe group consisting of methyl cellulose and hydroxyethylatedcelluloses.

2. A rodenticide acting as a stomach poison comprising methylcelluloseas carrier for the 5 poison used.

3. A rodenticide acting as a stomach poison comprising hydroxyethylcellulose as carrier for the poison used.

PAUL I-IERZIG. 40 HANS KiiKEN'mAL.

